18.4.2 Dynamic Loading SEN specimens were subjected to dynamic three-point bending such that the loading point is offset by 40 mm with respect to the crack. Figure 18.9 shows the isochromatics for a PMMA-Epoxy specimen during the fracture of the specimen. White star indicates the crack tip location at different times along the crack path. First five pictures show the development of the mixed mode stress field around the crack tip. In the sixth picture the crack has already started moving. After initiation, the Epoxy #4 #3 #2 #1 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 #15 #16 10 mm Fig. 18.9 Crack propagation in PMMA-Epoxy layered subjected to asymmetric three-point dynamic loading. The star indicates the crack tip in Epoxy layer. The time interval between two pictures is 15 microseconds 18 Mixed Mode Fracture Behavior of Layered Plates 153
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